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Mobile spammers have released a DIY phone number harvesting tool, but instead of advertising it solely on criminals-only online hangouts, they're trying to flog it out in the open.

The availability of the utility turns the simple act of submitting a mobile number to a website something that might lead to the receipt of more SMS (text message) spam.

The harvested information is later used for various malicious and fraudulent purposes.

Key features of the tool include automatic recognition of Russian and Ukrainian mobile phone providers (based on its initial target market), indexing based on a region and city for both Russia and Ukraine, multi-threaded software allowing up to 100 “indexing streams”, as well as an option to collect only numbers attached to a particular mobile provider.

"Cybercriminals and spammers are not strangers to the concept of market segmentation," explained Dancho Danchev, a security researcher at Webroot, in a blog post.

"Just like true marketers, the developer of the tool has included the option to choose a specific region within the available countries, with the idea to assist in the inevitable malicious and fraudulent activity that will result from this phone number harvesting activity."

Danchev advises surfers to double-check whether any website that requests your phone number is actually listing it on the web. The phone number harvesting tool has yet to crawl through sites that require authorisation or spread outside Russia and the Ukraine, he said, but future versions are likely to expanding indexing capabilities and geographical reach, Danchev warned.

The DIY phone number harvesting tool is an example of a wider trend of selling tools that once were exclusively available to sophisticated cybercriminals to less elite cybercrooks though underground forums. Services that offers a means to launch managed SMS flooding and phone ring flooding have recently become available through these forums. Both managed SMS flooding and phone ring flooding are pitched as a means to “take care of your competitor’s phone lines” or a DDoS attack on phones instead of websites. However, these services might easily lend themselves to helping along more ambitious scams, such as flooding out a bank's call centres to prevent early reports of card fraud cash-out operations, according to Webroot.

"By starting to advertise these very same malicious (DIY) tools and services on publicly accessible forums, they’re proving that they’re willing to sacrifice a certain degree of OPSEC (Operational Security) for the sake of growing their business model and attracting new customers," Danchev reports. ®

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